Loctite 263 High Strength Threadlocker 10ml

Loctite 263 is a one-component, red, high strength anaerobic threadlocker (dimethacrylate ester). Henkel designs it for the permanent locking and sealing of threaded fasteners.

Henkel states it works on active metals such as brass and copper and on passive substrates such as stainless steel and plated surfaces. It tolerates minor surface contamination from cutting, lubrication, anti-corrosion and protection oils.

Where this product is used

• Permanent locking and sealing of threaded fasteners
• Studs, nuts and bolts on active metals such as brass and copper
• Fasteners on stainless steel and plated surfaces
• As-received fasteners with minor oil contamination from cutting, lubrication or protection oils
• Slow-curing joints, where an activator can be used as a secondary cure

Features

• High strength, for permanent locking and sealing
• One component, no mixing
• Red liquid with positive fluorescence under UV light
• Cures on active metals and on passive substrates such as stainless steel
• Tolerates minor surface contamination from cutting, lubrication, anti-corrosion and protection oils
• Anaerobic cure, with an activator as a secondary cure
• 33 N·m breakaway torque on M10 steel nuts and bolts

Key specifications

Available sizes

Selecting the right option

For a medium strength grade see Loctite 243 Medium Strength Threadlocker; for low strength see Loctite 222 Low Strength Threadlocker.

To lock a fastener that is already assembled, see Loctite 290 Medium to High Strength Threadlocker, which wicks between engaged threads.

Using it

Hand tools may remove the fastener. Where they do not, apply localised heat to the nut or bolt to approximately 250 °C and disassemble while hot. This is a removal temperature, not an operating limit.

Cure speed depends on the materials, the gap and the temperature; the cure-speed graphs are in the Henkel data sheet. An activator can be used as a secondary cure where cure is slow.

Henkel states no operating temperature range. Cold strength was tested to -75 °C, and hot-strength data is given as a graph in the data sheet.

Storage and handling

Store unopened in a dry location. Henkel gives 8 °C to 21 °C as the optimal range. Storage below 8 °C or above 28 °C can adversely affect the properties of the product.

Limits and safety

Not recommended for pure oxygen or oxygen-rich systems, or as a sealant for chlorine or other strong oxidisers. Not normally recommended for plastics, as stress cracking can occur.

Frequently asked questions

What is the breakaway torque of Loctite 263?

On M10 steel nuts and bolts, unseated, cured 24 hours at 23 °C, Henkel gives 33 N·m breakaway and 33 N·m prevail torque (ISO 10964).

How do I remove Loctite 263?

Hand tools may work. Where they do not, apply localised heat to the nut or bolt to approximately 250 °C and disassemble while hot.

Does Loctite 263 work on stainless steel and plated parts?

Yes. Henkel states it works on active metals such as brass and copper and on passive substrates such as stainless steel and plated surfaces. An activator can improve cure speed where cure is slow.

What temperature can Loctite 263 handle?

The Henkel data sheet states no operating temperature range. It reports cold strength tested to -75 °C and gives hot strength as a graph only.

How long does Loctite 263 take to cure?

Henkel gives no fixture time in text, only cure-speed graphs. The data sheet reports a compressive shear strength of at least 9.0 N/mm² on steel pins and collars (ISO 10123).

Does Loctite 263 have any approvals?

The current Henkel data sheet lists no approvals; contact AIMS if you need a certificate for a specific application.

Related products

See also: Loctite 243 Medium Strength Threadlocker, Loctite 222 Low Strength Threadlocker, Loctite 290 Medium to High Strength Threadlocker, Loctite 271 High Strength Threadlocker 50ml, Loctite 7471 Primer T Surface Preparation Activator Aerosol 133g.